exam Maths Puzzle Numerical Ability

Y=3x+5
2y-6x=4
using elimination

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exam Other Question

A man who is 75 inches tall is 15 inches on a TV monitor. The image of his friend is 13 inches tall on monitor. How tall is his friend. hi, my son asked me some questions on algebra but i myself was confused. hope u can help me to help him with these.write these follwing expressions in the simplest form:

1. b+7+2b+10
2. (3d+5)+(d-2)
3. 3m-(-m)