https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBuEjGM4eKWbMitwFPxma5zerReOCdH3uhCqs7NQVEbteXkNzvzQrjhVZlt7FnacxrjhqFZwgAtY3dbl3_eBwK-LLTgmvNolJOaPOOTRxgdI4oBtbHGWNAsQpRRmdvUw7YoKzMObbX31U/s1600/Page_4_Problem_9.jpg
Value of x is going up by 5 and the slope should be 10/5 or 2 not 10/1. Inserting the points, the final equation will be solved. Y is not equal to 9+10x in the chart
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghNQLHG6o9cST9mDIkoC671psI0OOdb3aafpdUWq7LCEB89yOfl_UI7SiztwvCGmdERKkRfD_W7VRfhQ__XRHMbs138ZvqDdDpfVZnvJSQMY2NJFPdO9wgXChsLlicBsYbFGAHZKPitdg/s1600/Page_8_Problem_16.jpg
To have a point it must try to solve both equations. So (1,2) only solves the first one and not the second one
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHHwE-PSjRlFhywerLEnP98IAKsDXyu9J1-6UrJePYjL1zdcszsMT6jrubOwT9dY2LWwT1t7tcpqFeNrY335sMcFmgUCWE3Yvqsnhk_7yaZyoHS69BYPURJDx7o-UkoCAB1V_cJDxbxY8/s1600/Page_19_Problem_22_and_23.
20)shading is correct
should be dotted line and not solid .
#21 the solid line is correct, but the shading should be below the line, not above it.
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtHC9QYK3cgnpvPGXc1n3WSjbApC0AIAg5V3L58TfaGgPPpq-M35QTjRAv6yWo_IPc-CDzIabtkn1nLNUIZRdUZYM36kygzU8JwAyAs1_IxSFff-UXf4NF-52CiNV9sEy11RPpYU_NHk4/s1600/Page_21_Problem_20_and_21.jpg
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