exam Maths Puzzle Numerical Ability

Find values of m and b so that the solution is (-3,4). 5x+7y=b mx+y=22
I have come up with m(-3)+4=22 -15+28=6 13=b m=6

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exam Other Question

Solve each system by graphing.
y=-3x-3
y=x+5 During a holiday season, a company employs 2100 people. There are twice as many part time employees as full time employees. How many part time employees are employed during the holiday season?